Question

我试图从数据表中获取最新价格。数据将如下所示：

零件价格日期

----- ----- --------

10525 .25 1/1/2010

10525 5.00 7/6/2014

10526 4.25 7/1/2014

我尝试使用连接，以便我可以得到＆＃34; 10525 5.00 7/6/2014＆＃34;的结果，但它给了我这个错误：

列前缀＆＃39; orderdtl＆＃39;与查询中使用的表名或别名不匹配。声明无法准备。＆＃34;

如果我把联接拿出来，它就可以了。我哪里错了？

SELECT orderdtl.partnum, orderdtl.docunitprice, orderhed.orderdate
FROM mfgsys80.dbo.orderdtl AS orderdtl, mfgsys80.dbo.orderhed AS orderhed
INNER JOIN(
    SELECT orderdtl.partnum, MAX(orderhed.orderdate) AS 'maxDate'
    FROM mfgsys80.dbo.orderdtl AS orderdtl, mfgsys80.dbo.orderhed AS orderhed
    GROUP BY orderdtl.partnum
) AS Temp
    ON orderdtl.partnum = Temp.partnum AND orderhed.orderdate = Temp.maxDate
WHERE orderdtl.ordernum = orderhed.ordernum AND ((orderdtl.custnum=74))
ORDER BY orderdtl.partnum

Answer 1

您查询编队是错误的。它应该像

SELECT orderdtl.partnum, orderdtl.docunitprice, orderhed.orderdate
FROM mfgsys80.dbo.orderdtl AS orderdtl
JOIN mfgsys80.dbo.orderhed AS orderhed
ON orderdtl.ordernum = orderhed.ordernum
INNER JOIN(
    SELECT ol.partnum, MAX(od.orderdate) AS 'maxDate'
    FROM mfgsys80.dbo.orderdtl ol 
    JOIN mfgsys80.dbo.orderhed od
    ON ol.ordernum = od.ordernum
    GROUP BY ol.partnum
) Temp
ON orderdtl.partnum = Temp.partnum 
AND orderhed.orderdate = Temp.maxDate
WHERE  orderdtl.custnum=74
ORDER BY orderdtl.partnum

SQL左连接子查询问题

1 个答案: